package com.atcumt.community.controller;

import com.atcumt.community.entity.User;
import com.atcumt.community.service.UserService;
import com.atcumt.community.util.CommunityConstant;
import com.atcumt.community.util.CommunityUtil;
import com.atcumt.community.util.RedisKeyUtil;
import com.google.code.kaptcha.Producer;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.imageio.ImageIO;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;
import java.util.concurrent.TimeUnit;

// 登录模块前后端交互实现
@Controller
public class LoginController implements CommunityConstant {

    private static final Logger logger = LoggerFactory.getLogger(LoginController.class);

    @Autowired
    private UserService userService;

    @Autowired
    private Producer kaptchaProducer;

    @Autowired
    private RedisTemplate redisTemplate;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @RequestMapping(path = "/register", method = RequestMethod.GET)
    public String getRegisterPage() {
        return "/site/register";
    }

    @RequestMapping(path = "/login", method = RequestMethod.GET)
    public String getLoginPage() {
        return "/site/login";
    }

    @RequestMapping(path = "/register", method = RequestMethod.POST)
    public String register(Model model, User user) {
        Map<String, Object> map = userService.register(user);

        // 根据业务层返回的 map.进一步对浏览器做出响应
        // 注册成功，返回中间页面提示结果
        if (map == null || map.isEmpty()) {
            model.addAttribute("msg", "注册成功,我们已经向您的邮箱发送了一封激活邮件,请尽快激活!");
            model.addAttribute("target", "/index");
            return "/site/operate-result";
        } else {
            // 注册失败，return 回原来的页面
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            model.addAttribute("emailMsg", map.get("emailMsg"));
            return "/site/register";
        }
    }

    // http://localhost:8080/community/activation/101/code
    // 激活操作，处理激活业务请求。先跳到 operate-result发送激活结果
    @RequestMapping(path = "/activation/{userId}/{code}", method = RequestMethod.GET)
    public String activation(Model model, @PathVariable("userId") int userId, @PathVariable("code") String code) {
        int result = userService.activation(userId, code);
        if (result == ACTIVATION_SUCCESS) {
            model.addAttribute("msg", "激活成功,您的账号已经可以正常使用了!");
            model.addAttribute("target", "/login");
        } else if (result == ACTIVATION_REPEAT) {
            model.addAttribute("msg", "无效操作,该账号已经激活过了!");
            model.addAttribute("target", "/index");
        } else {
            model.addAttribute("msg", "激活失败,您提供的激活码不正确!");
            model.addAttribute("target", "/index");
        }
        return "/site/operate-result";
    }

    // 得到验证码，存入session
//    @RequestMapping(path = "/kaptcha", method = RequestMethod.GET)
//    public void getKaptcha(HttpServletResponse response, HttpSession session) {
//        // 生成验证码
//        String text = kaptchaProducer.createText(); // 得到四位的字符串
//        BufferedImage image = kaptchaProducer.createImage(text); // 将这四位的字符串转为图片
//
//        // 验证码存入session
//        session.setAttribute("kaptcha", text);
//
//        // 将图片输出给浏览器，输出流
//        response.setContentType("image/png");
//        try {
//            OutputStream os = response.getOutputStream();
//            ImageIO.write(image, "png", os);
//        } catch (IOException e) {
//            logger.error("响应验证码失败:" + e.getMessage());
//        }
//    }

    // 得到验证码，存入redis
    @RequestMapping(path = "/kaptcha", method = RequestMethod.GET)
    public void getKaptcha(HttpServletResponse response) {
        // 生成验证码
        String text = kaptchaProducer.createText(); // 得到四位的字符串
        BufferedImage image = kaptchaProducer.createImage(text); // 将这四位的字符串转为图片

        // 验证码的归属：临时凭证发给客户端，用cookie保存
        String kaptchaOwner = CommunityUtil.generateUUID();
        Cookie cookie = new Cookie("kaptchaOwner", kaptchaOwner);
        cookie.setMaxAge(60);  // 生效时间：60秒
        cookie.setPath(contextPath);  // 路径为整个项目下都有效
        response.addCookie(cookie);  // 添加到response中发送给客户端

        // 验证码存入redis
        String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
        redisTemplate.opsForValue().set(redisKey, text, 60, TimeUnit.SECONDS);


        // 将图片输出给浏览器，输出流
        response.setContentType("image/png");
        try {
            OutputStream os = response.getOutputStream();
            ImageIO.write(image, "png", os);
        } catch (IOException e) {
            logger.error("响应验证码失败:" + e.getMessage());
        }
    }

    // 处理登录业务请求, 从 session获取验证码
    // 处理表单提交数据的情况，用 post请求增加数据
//    @RequestMapping(path = "/login", method = RequestMethod.POST)
//    public String login(String username, String password, String code, boolean rememberme,
//                        Model model, HttpSession session, HttpServletResponse response) {
//        // 检查验证码
//        String kaptcha = (String) session.getAttribute("kaptcha");
//        if (StringUtils.isBlank(kaptcha) || StringUtils.isBlank(code) || !kaptcha.equalsIgnoreCase(code)) {
//            model.addAttribute("codeMsg", "验证码不正确!");
//            return "/site/login";
//        }
//
//        // 检查账号,密码
//        int expiredSeconds = rememberme ? REMEMBER_EXPIRED_SECONDS : DEFAULT_EXPIRED_SECONDS;
//        Map<String, Object> map = userService.login(username, password, expiredSeconds);
//        // 登录凭证验证成功，登陆成功，跳转到首页
//        if (map.containsKey("ticket")) {
//            // 给客户端发送 cookie，内容就是登录凭证
//            Cookie cookie = new Cookie("ticket", map.get("ticket").toString());
//            cookie.setPath(contextPath); // cookie生效的路径，项目路径
//            cookie.setMaxAge(expiredSeconds);
//            response.addCookie(cookie);
//            return "redirect:/index";
//        } else {
//            model.addAttribute("usernameMsg", map.get("usernameMsg"));
//            model.addAttribute("passwordMsg", map.get("passwordMsg"));
//            return "/site/login";
//        }
//    }

    // 处理登录业务请求, redis获取验证码
    @RequestMapping(path = "/login", method = RequestMethod.POST)
    public String login(String username, String password, String code, boolean rememberme,
                        Model model, HttpServletResponse response,
                        @CookieValue("kaptchaOwner")String kaptchaOwner) {
        // 检查验证码
        String kaptcha = null;
        if (StringUtils.isBlank(kaptchaOwner)) {
            String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
            kaptcha = (String) redisTemplate.opsForValue().get(redisKey);
        }

        if (StringUtils.isBlank(kaptcha) || StringUtils.isBlank(code) || !kaptcha.equalsIgnoreCase(code)) {
            model.addAttribute("codeMsg", "验证码不正确!");
            return "/site/login";
        }

        // 检查账号,密码
        int expiredSeconds = rememberme ? REMEMBER_EXPIRED_SECONDS : DEFAULT_EXPIRED_SECONDS;
        Map<String, Object> map = userService.login(username, password, expiredSeconds);
        // 登录凭证验证成功，登陆成功，跳转到首页
        if (map.containsKey("ticket")) {
            // 给客户端发送 cookie，内容就是登录凭证
            Cookie cookie = new Cookie("ticket", map.get("ticket").toString());
            cookie.setPath(contextPath); // cookie生效的路径，项目路径
            cookie.setMaxAge(expiredSeconds);
            response.addCookie(cookie);
            return "redirect:/index";
        } else {
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            return "/site/login";
        }
    }

    // 登出操作：重定向到登陆页面
    // @CookieValue: 浏览器取出cookie传给服务器
    @RequestMapping(path = "/logout", method = RequestMethod.GET)
    public String logout(@CookieValue("ticket") String ticket) {
        userService.logout(ticket);
        return "redirect:/login";
    }
}
